21842 leans slightly Republican by roughly 14 points: about 43% of voters vote Democratic and 57% Republican.
About 83% of adults in 21842 typically vote, above the U.S. average of about 62%. Among adults in 21842, ~36% vote Democratic, ~47% Republican, and ~17% don't vote. The map below shows estimated turnout by block group.
How 21842 compares
Among zip codes within 15 miles, 21842 leans more Republican than 5 of 13 neighbors.
21842 runs about 42 points more Republican than Maryland as a whole. Maryland leans Democratic overall, while 21842 is one of the few Republican-leaning pockets.
Politics vary noticeably by block within 21842. The west side is the most Republican-leaning (R+20) and the east side is the least Republican-leaning (R+5), a spread of about 15 points.
Why 21842 leans the way it does
This analysis examined 14,881 data points per zip code to find what predicts political lean and turnout. The items below are a few correlations that stood out for 21842, not a ranked or complete list of what matters most.
21842 votes against the grain of Maryland. Maryland leans Democratic overall, while 21842 runs about 42 points more Republican.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; 21842, MD sits in the top quarter nationally on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in 21842 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 21842 is in the top quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 67%, about 7 points above the U.S. average of 60%. Learn more about the findings and methodology on the political spectrum map.
Nearby Zip Codes
Zip Codes with Similar Populations
Sources and methodology
Precinct-level voting records used to fit the model come from Maryland State Board of Elections, distributed by the Voting and Election Science Team. Demographic inputs come from the U.S. Census Bureau (ACS 5-year estimates and the 2020 Decennial Census). Health and environmental inputs come from the CDC (PLACES and the Environmental Justice Index). Land cover comes from the USGS and EPA. Election-day and lead-up weather come from PRISM 4km daily grids and the NOAA Global Historical Climatology Network. Mail-voting and election-administration patterns come from the MIT Election Lab's Survey of the Performance of American Elections. Block-group crime detail comes from CrimeGrade. Internet data and modeling support provided by ISPreports.org.
Modeling and analysis by the BestNeighborhood data science team. Full methodology and findings: political spectrum map.
Methodology reviewed by the BestNeighborhood data team. Last updated May 2026.